sad·den /ˈsædṇ/
  (vt.)使憂愁,使悲哀(vi.)憂愁,悲哀
  Sad·den, v. i. To become, or be made, sad.
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  Sad·den v. t. [imp. & p. p. Saddened p. pr. & vb. n. Saddening.] To make sad. Specifically: (a) To render heavy or cohesive. [Obs.]
     Marl is binding, and saddening of land is the great prejudice it doth to clay lands.   --Mortimer.
  (b) To make dull- or sad-colored, as cloth. (c) To make grave or serious; to make melancholy or sorrowful.
     Her gloomy presence saddens all the scene.   --Pope.
  sadden
       v 1: make unhappy; `The news of her death saddened me' [ant: gladden]
       2: come to feel sad [ant: gladden]